python: upgrade to version 2.7.11

And split python-dev and python-lib2to3 packages.
Seems for python3 this was done, so we'll sync here.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/files/python-package-dev.mk

@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2006-2015 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+define Package/python-dev
+$(call Package/python/Default)
+  TITLE:=Python $(PYTHON_VERSION) development files
+  DEPENDS:=+python
+endef
+
+define PyPackage/python-dev/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(CP) $(PKG_INSTALL_DIR)/usr/bin/python*config $(1)/usr/bin
+	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libpython$(PYTHON_VERSION).so* $(1)/usr/lib
+endef
+
+$(eval $(call PyBasePackage,python-dev, \
+	/usr/lib/python$(PYTHON_VERSION)/config \
+	/usr/include/python$(PYTHON_VERSION) \
+	/usr/lib/pkgconfig \
+	, \
+	DO_NOT_ADD_TO_PACKAGE_DEPENDS \
+))
+